Preparation and Properties of Walnut Protein Isolate-Chitosan Nanoparticles Stabilized Pickering Emulsion

LIN Yumei; LU Yanling; LIU Jiaqi; FAN Fangyu

doi:10.13386/j.issn1002-0306.2024070364

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LIN Yumei, LU Yanling, LIU Jiaqi, et al. Preparation and Properties of Walnut Protein Isolate-Chitosan Nanoparticles Stabilized Pickering Emulsion[J]. Science and Technology of Food Industry, 2025, 46(10): 1−8. (in Chinese with English abstract). doi: 10.13386/j.issn1002-0306.2024070364.

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Preparation and Properties of Walnut Protein Isolate-Chitosan Nanoparticles Stabilized Pickering Emulsion

LIN Yumei^1,,
LU Yanling¹,
LIU Jiaqi¹,
FAN Fangyu^{1, 2, 3, ,}

1.
College of Biological and Food Engineering, Southwest Forestry University, Kunming 650224, China
2.
Key Laboratory of National Forestry and Grassland Administration on Biodiversity Conservation in Southwest China, Kunming 650224, China
3.
Key Laboratory of Forest Disaster Warning and Control of Yunnan Province, Kunming 650224, China

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Received Date: July 25, 2024
Available Online: March 12, 2025

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Abstract

Abstract

Via electrostatic interactions, walnut protein isolate (WPI) and chitosan (CS) were assembled into WPI-CS nanoparticles, which were then used to stabilize Pickering emulsions, achieving high-value utilization of walnut protein resources. The effects of the mass ratio of WPI to CS were investigated via differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), nanoparticle size analysis, zeta potential measurement, and other analytical techniques. The microstructure, rheological properties, and storage stability of the Pickering emulsions were analyzed to evaluate the influence of nanoparticle concentration (0.5%~2.5%) and oil phase volume (20%~60%). Results indicated that at a WPI:CS mass ratio of 5:3, the melting temperature reached 80.16 °C, while the WPI-CS nanoparticles exhibited a size of 846.43 nm and a zeta potential of 56.63 mV, demonstrating excellent emulsification capacity and stability. A tightly crosslinked network structure was formed through hydrogen bonding and electrostatic interactions between the modified WPI and CS-combined WPI. The minimum droplet size of the Pickering emulsion was 18.05 μm under the optimal conditions: a WPI:CS mass ratio of 5:3, oil phase volume fraction of 40%, and WPI-CS nanoparticle concentration of 1.5% (w/w). After 15 days of storage, the emulsion maintained uniform droplet distribution with preserved spherical morphology. A gel network structure dominated by elasticity was observed within the emulsion, exhibiting frequency-dependent degradation during dynamic oscillatory rheological testing.
- walnut isolate protein,
- chitosan,
- nanoparticles,
- pickering emulsion,
- stability

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References (31)

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